Malicious PDF — malware analysis report

Static analysis result for SHA-256 6058da9eb81b9e23…

MALICIOUS

PDF

37.0 KB Created: 2020-04-19 12:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2c3982e234c9850833dbf34f980d73f SHA-1: 532dceb9cee81bf7dae5e7c4522ab03b0a78de6e SHA-256: 6058da9eb81b9e23104cac72e234db4589b2060065800265838325470e7a8a5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the sheer volume of outbound links suggests an attempt to manipulate search engine results or distribute a payload via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://datanetguatemala.com/uploads/1/3/1/4/131437982/131437982.html#vinpro+cost+guide+2018
    • http://jpierre.shop/uploads/1/3/1/3/131383594/lupivu.pdf
    • http://nationalcasinomarketing.com/uploads/1/3/0/2/130271157/xewobonado_jagifuzorif.pdf
    • http://inboxfitnesstrainer.com/uploads/1/3/0/6/130620568/4050269.pdf
    • http://wgk-surgery.com/uploads/1/3/0/7/130776403/fb3ce.pdf
    • http://woodandbrush.com/uploads/1/3/1/4/131453053/fd7624ed0b.pdf
    • http://ruralhealthnetworkresources.com/uploads/1/3/0/8/130814360/856d9cdc9.pdf
    • http://heartshareai360.org/uploads/1/3/1/3/131398400/5cd2688068c1.pdf
    • http://tugaiptv.eu/uploads/1/3/0/6/130605442/9698993.pdf
    • http://finpointresearch.com/uploads/1/3/0/9/130969475/lodivokimokamasa.pdf
    • http://vikibrown.com/uploads/1/3/0/6/130604752/1810a1c.pdf
    • http://jentlaw.com/uploads/1/3/0/2/130289387/vevogubibafar_kajub_zumideva.pdf
    • http://labisbyjoco23.com/uploads/1/3/0/4/130483632/gedorab.pdf
    • http://piratemgmt.com/uploads/1/3/0/5/130588389/lugibudiromako.pdf
    • http://heardnewmanrealestate.com/uploads/1/3/1/6/131636612/6724989.pdf
    • http://mngstories.com/uploads/1/3/1/3/131398472/jopib_kejubatusotarup_laritibawuwupo_wukogazulizep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006816.bin
c9bbae0b3659a725dd171290da6d65f26e52569ff71c4e803be2ffd613a96a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6816 7892 bytes

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